GHSA-r925-mgvr-h9cc

Suggest an improvement
Source
https://github.com/advisories/GHSA-r925-mgvr-h9cc
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-r925-mgvr-h9cc/GHSA-r925-mgvr-h9cc.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-r925-mgvr-h9cc
Aliases
Published
2026-10-27T19:01:39Z
Modified
2026-10-27T19:15:22Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
Symfony: ReDoS in HeaderUtils::split() Reachable Through the Cache-Control Request Header
Details

Description

HeaderUtils::split() parsed header values with a pattern whose token alternative also matched whitespace, followed by a (?<!\s) lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. HeaderBag calls it for the Cache-Control header whenever a Request is built, so any application handling HTTP requests is reachable, with no authentication.

A single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, preg_match_all() gives up at pcre.backtrack_limit and split() returns an empty array, so every directive of the header is silently dropped.

Resolution

The pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: HeaderUtils::split('foo bar', ' ') returned a single value in 6.4.46 to 6.4.47, 7.4.19 to 7.4.20 and 8.1.7 to 8.1.8. Whitespace characters used as separators are now left out of the whitespace branch, which 6.4.48, 7.4.21 and 8.1.9 contain.

The patches for this issue are available here for branch 5.4 (and forward-ported to 6.4, 7.4, 8.1 and 8.2).

Credits

Symfony would like to thank r3verii for reporting the issue and Nicolas Grekas for providing the fix.

Symfony would also like to thank Bruno Dias from Checkmarx for his help getting a CVE assigned.

Database specific 
{
    "cwe_ids":  [
        "CWE-1333"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-10-27T19:01:39Z",
    "nvd_published_at":  "2026-10-15T15:17:22Z",
    "severity":  "HIGH"
}
References

Affected packages

Packagist
symfony/http-foundation

Package

Name
symfony/http-foundation
Purl
pkg:composer/symfony/http-foundation

Affected ranges

Type
ECOSYSTEM
Events
Introduced
6.0.1
Fixed
6.4.46

Affected versions

v6.*
v6.0.1
v6.0.2
v6.0.3
v6.0.5
v6.0.6
v6.0.7
v6.0.8
v6.0.9
v6.0.10
v6.0.11
v6.0.12
v6.0.13
v6.0.14
v6.0.15
v6.0.16
v6.0.17
v6.0.19
v6.0.20
v6.1.0-BETA1
v6.1.0-BETA2
v6.1.0-RC1
v6.1.0
v6.1.1
v6.1.2
v6.1.3
v6.1.4
v6.1.5
v6.1.6
v6.1.7
v6.1.8
v6.1.9
v6.1.11
v6.1.12
v6.2.0-BETA1
v6.2.0-BETA3
v6.2.0-RC1
v6.2.0
v6.2.1
v6.2.2
v6.2.5
v6.2.6
v6.2.7
v6.2.8
v6.2.10
v6.2.11
v6.2.12
v6.2.13
v6.3.0-BETA1
v6.3.0-BETA3
v6.3.0-RC1
v6.3.0
v6.3.1
v6.3.2
v6.3.4
v6.3.5
v6.3.6
v6.3.7
v6.3.8
v6.3.9
v6.3.11
v6.3.12
v6.4.0-BETA1
v6.4.0-BETA2
v6.4.0-BETA3
v6.4.0-RC1
v6.4.0-RC2
v6.4.0
v6.4.2
v6.4.3
v6.4.4
v6.4.7
v6.4.8
v6.4.10
v6.4.12
v6.4.13
v6.4.14
v6.4.15
v6.4.16
v6.4.18
v6.4.21
v6.4.22
v6.4.23
v6.4.24
v6.4.25
v6.4.26
v6.4.28
v6.4.29
v6.4.30
v6.4.31
v6.4.32
v6.4.33
v6.4.34
v6.4.35
v6.4.41
v6.4.42
v6.4.43
v6.4.44
v6.4.45

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-r925-mgvr-h9cc/GHSA-r925-mgvr-h9cc.json"
symfony/http-foundation

Package

Name
symfony/http-foundation
Purl
pkg:composer/symfony/http-foundation

Affected ranges

Type
ECOSYSTEM
Events
Introduced
7.0.0
Fixed
7.4.19

Affected versions

v7.*
v7.0.0
v7.0.3
v7.0.4
v7.0.6
v7.0.7
v7.0.8
v7.0.10
v7.1.0-BETA1
v7.1.0-RC1
v7.1.0
v7.1.1
v7.1.3
v7.1.5
v7.1.6
v7.1.7
v7.1.8
v7.1.9
v7.1.10
v7.1.11
v7.2.0-BETA1
v7.2.0-BETA2
v7.2.0-RC1
v7.2.0
v7.2.2
v7.2.3
v7.2.5
v7.2.6
v7.2.7
v7.2.8
v7.2.9
v7.3.0-BETA1
v7.3.0-BETA2
v7.3.0-RC1
v7.3.0
v7.3.1
v7.3.2
v7.3.3
v7.3.4
v7.3.5
v7.3.6
v7.3.7
v7.3.8
v7.3.9
v7.3.10
v7.3.11
v7.4.0-BETA1
v7.4.0-BETA2
v7.4.0-RC1
v7.4.0
v7.4.1
v7.4.3
v7.4.4
v7.4.5
v7.4.6
v7.4.7
v7.4.8
v7.4.13
v7.4.14
v7.4.15
v7.4.16
v7.4.17
v7.4.18

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-r925-mgvr-h9cc/GHSA-r925-mgvr-h9cc.json"
symfony/http-foundation

Package

Name
symfony/http-foundation
Purl
pkg:composer/symfony/http-foundation

Affected ranges

Type
ECOSYSTEM
Events
Introduced
8.0.0
Fixed
8.1.7

Affected versions

v8.*
v8.0.0
v8.0.1
v8.0.3
v8.0.4
v8.0.5
v8.0.6
v8.0.7
v8.0.8
v8.0.13
v8.0.14
v8.0.15
v8.1.0-BETA1
v8.1.0-BETA3
v8.1.0-RC1
v8.1.0
v8.1.1
v8.1.2
v8.1.4
v8.1.5
v8.1.6

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-r925-mgvr-h9cc/GHSA-r925-mgvr-h9cc.json"
symfony/symfony

Package

Name
symfony/symfony
Purl
pkg:composer/symfony/symfony

Affected ranges

Type
ECOSYSTEM
Events
Introduced
6.0.1
Fixed
6.4.46

Affected versions

v6.*
v6.0.1
v6.0.2
v6.0.3
v6.0.4
v6.0.5
v6.0.6
v6.0.7
v6.0.8
v6.0.9
v6.0.10
v6.0.11
v6.0.12
v6.0.13
v6.0.14
v6.0.15
v6.0.16
v6.0.17
v6.0.18
v6.0.19
v6.0.20
v6.1.0-BETA1
v6.1.0-BETA2
v6.1.0-RC1
v6.1.0
v6.1.1
v6.1.2
v6.1.3
v6.1.4
v6.1.5
v6.1.6
v6.1.7
v6.1.8
v6.1.9
v6.1.10
v6.1.11
v6.1.12
v6.2.0-BETA1
v6.2.0-BETA2
v6.2.0-BETA3
v6.2.0-RC1
v6.2.0-RC2
v6.2.0
v6.2.1
v6.2.2
v6.2.3
v6.2.4
v6.2.5
v6.2.6
v6.2.7
v6.2.8
v6.2.9
v6.2.10
v6.2.11
v6.2.12
v6.2.13
v6.2.14
v6.3.0-BETA1
v6.3.0-BETA2
v6.3.0-BETA3
v6.3.0-RC1
v6.3.0-RC2
v6.3.0
v6.3.1
v6.3.2
v6.3.3
v6.3.4
v6.3.5
v6.3.6
v6.3.7
v6.3.8
v6.3.9
v6.3.10
v6.3.11
v6.3.12
v6.4.0-BETA1
v6.4.0-BETA2
v6.4.0-BETA3
v6.4.0-RC1
v6.4.0-RC2
v6.4.0
v6.4.1
v6.4.2
v6.4.3
v6.4.4
v6.4.5
v6.4.6
v6.4.7
v6.4.8
v6.4.9
v6.4.10
v6.4.11
v6.4.12
v6.4.13
v6.4.14
v6.4.15
v6.4.16
v6.4.17
v6.4.18
v6.4.19
v6.4.20
v6.4.21
v6.4.22
v6.4.23
v6.4.24
v6.4.25
v6.4.26
v6.4.27
v6.4.28
v6.4.29
v6.4.30
v6.4.31
v6.4.32
v6.4.33
v6.4.34
v6.4.35
v6.4.36
v6.4.37
v6.4.38
v6.4.39
v6.4.40
v6.4.41
v6.4.42
v6.4.43
v6.4.44
v6.4.45

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-r925-mgvr-h9cc/GHSA-r925-mgvr-h9cc.json"
symfony/symfony

Package

Name
symfony/symfony
Purl
pkg:composer/symfony/symfony

Affected ranges

Type
ECOSYSTEM
Events
Introduced
7.0.0
Fixed
7.4.19

Affected versions

v7.*
v7.0.0
v7.0.1
v7.0.2
v7.0.3
v7.0.4
v7.0.5
v7.0.6
v7.0.7
v7.0.8
v7.0.9
v7.0.10
v7.1.0-BETA1
v7.1.0-RC1
v7.1.0
v7.1.1
v7.1.2
v7.1.3
v7.1.4
v7.1.5
v7.1.6
v7.1.7
v7.1.8
v7.1.9
v7.1.10
v7.1.11
v7.2.0-BETA1
v7.2.0-BETA2
v7.2.0-RC1
v7.2.0
v7.2.1
v7.2.2
v7.2.3
v7.2.4
v7.2.5
v7.2.6
v7.2.7
v7.2.8
v7.2.9
v7.3.0-BETA1
v7.3.0-BETA2
v7.3.0-RC1
v7.3.0
v7.3.1
v7.3.2
v7.3.3
v7.3.4
v7.3.5
v7.3.6
v7.3.7
v7.3.8
v7.3.9
v7.3.10
v7.3.11
v7.4.0-BETA1
v7.4.0-BETA2
v7.4.0-RC1
v7.4.0-RC2
v7.4.0-RC3
v7.4.0
v7.4.1
v7.4.2
v7.4.3
v7.4.4
v7.4.5
v7.4.6
v7.4.7
v7.4.8
v7.4.9
v7.4.10
v7.4.11
v7.4.12
v7.4.13
v7.4.14
v7.4.15
v7.4.16
v7.4.17
v7.4.18

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-r925-mgvr-h9cc/GHSA-r925-mgvr-h9cc.json"
symfony/symfony

Package

Name
symfony/symfony
Purl
pkg:composer/symfony/symfony

Affected ranges

Type
ECOSYSTEM
Events
Introduced
8.0.0
Fixed
8.1.7

Affected versions

v8.*
v8.0.0
v8.0.1
v8.0.2
v8.0.3
v8.0.4
v8.0.5
v8.0.6
v8.0.7
v8.0.8
v8.0.9
v8.0.10
v8.0.11
v8.0.12
v8.0.13
v8.0.14
v8.0.15
v8.0.16
v8.1.0-BETA1
v8.1.0-BETA2
v8.1.0-BETA3
v8.1.0-RC1
v8.1.0
v8.1.1
v8.1.2
v8.1.3
v8.1.4
v8.1.5
v8.1.6

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-r925-mgvr-h9cc/GHSA-r925-mgvr-h9cc.json"
symfony/http-foundation

Package

Name
symfony/http-foundation
Purl
pkg:composer/symfony/http-foundation

Affected ranges

Type
ECOSYSTEM
Events
Introduced
4.1.0
Fixed
5.4.54

Affected versions

v4.*
v4.1.0
v4.1.1
v4.1.2
v4.1.3
v4.1.4
v4.1.5
v4.1.6
v4.1.7
v4.1.8
v4.1.9
v4.1.10
v4.1.11
v4.1.12
v4.2.0-BETA1
v4.2.0-BETA2
v4.2.0-RC1
v4.2.0
v4.2.1
v4.2.2
v4.2.3
v4.2.4
v4.2.5
v4.2.6
v4.2.7
v4.2.8
v4.2.9
v4.2.10
v4.2.11
v4.2.12
v4.3.0-BETA1
v4.3.0-BETA2
v4.3.0-RC1
v4.3.0
v4.3.1
v4.3.2
v4.3.3
v4.3.4
v4.3.5
v4.3.6
v4.3.7
v4.3.8
v4.3.9
v4.3.10
v4.3.11
v4.4.0-BETA1
v4.4.0-BETA2
v4.4.0-RC1
v4.4.0
v4.4.1
v4.4.2
v4.4.3
v4.4.4
v4.4.5
v4.4.6
v4.4.7
v4.4.8
v4.4.9
v4.4.10
v4.4.11
v4.4.12
v4.4.13
v4.4.14
v4.4.15
v4.4.16
v4.4.17
v4.4.18
v4.4.19
v4.4.20
v4.4.22
v4.4.23
v4.4.25
v4.4.26
v4.4.27
v4.4.29
v4.4.30
v4.4.33
v4.4.34
v4.4.36
v4.4.37
v4.4.38
v4.4.39
v4.4.41
v4.4.42
v4.4.43
v4.4.44
v4.4.45
v4.4.46
v4.4.47
v4.4.48
v4.4.49
v5.*
v5.0.0-BETA1
v5.0.0-BETA2
v5.0.0-RC1
v5.0.0
v5.0.1
v5.0.2
v5.0.3
v5.0.4
v5.0.5
v5.0.6
v5.0.7
v5.0.8
v5.0.9
v5.0.10
v5.0.11
v5.1.0-BETA1
v5.1.0-RC1
v5.1.0-RC2
v5.1.0
v5.1.1
v5.1.2
v5.1.3
v5.1.4
v5.1.5
v5.1.6
v5.1.7
v5.1.8
v5.1.9
v5.1.10
v5.1.11
v5.2.0-BETA1
v5.2.0-BETA2
v5.2.0-BETA3
v5.2.0-RC1
v5.2.0-RC2
v5.2.0
v5.2.1
v5.2.2
v5.2.3
v5.2.4
v5.2.7
v5.2.8
v5.2.10
v5.2.11
v5.2.12
v5.2.14
v5.3.0-BETA1
v5.3.0-BETA2
v5.3.0-BETA3
v5.3.0-RC1
v5.3.0
v5.3.1
v5.3.2
v5.3.3
v5.3.4
v5.3.6
v5.3.7
v5.3.10
v5.3.11
v5.3.13
v5.3.14
v5.4.0-BETA1
v5.4.0-RC1
v5.4.0
v5.4.1
v5.4.2
v5.4.3
v5.4.5
v5.4.6
v5.4.8
v5.4.9
v5.4.10
v5.4.11
v5.4.12
v5.4.13
v5.4.14
v5.4.15
v5.4.16
v5.4.17
v5.4.19
v5.4.20
v5.4.21
v5.4.22
v5.4.23
v5.4.24
v5.4.25
v5.4.26
v5.4.28
v5.4.30
v5.4.31
v5.4.32
v5.4.34
v5.4.35
v5.4.38
v5.4.39
v5.4.40
v5.4.42
v5.4.44
v5.4.45
v5.4.46
v5.4.48
v5.4.50

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-r925-mgvr-h9cc/GHSA-r925-mgvr-h9cc.json"
symfony/symfony

Package

Name
symfony/symfony
Purl
pkg:composer/symfony/symfony

Affected ranges

Type
ECOSYSTEM
Events
Introduced
4.1.0
Fixed
5.4.54

Affected versions

v4.*
v4.1.0
v4.1.1
v4.1.2
v4.1.3
v4.1.4
v4.1.5
v4.1.6
v4.1.7
v4.1.8
v4.1.9
v4.1.10
v4.1.11
v4.1.12
v4.1.13
v4.2.0-BETA1
v4.2.0-BETA2
v4.2.0-RC1
v4.2.0
v4.2.1
v4.2.2
v4.2.3
v4.2.4
v4.2.5
v4.2.6
v4.2.7
v4.2.8
v4.2.9
v4.2.10
v4.2.11
v4.2.12
v4.3.0-BETA1
v4.3.0-BETA2
v4.3.0-RC1
v4.3.0
v4.3.1
v4.3.2
v4.3.3
v4.3.4
v4.3.5
v4.3.6
v4.3.7
v4.3.8
v4.3.9
v4.3.10
v4.3.11
v4.4.0-BETA1
v4.4.0-BETA2
v4.4.0-RC1
v4.4.0
v4.4.1
v4.4.2
v4.4.3
v4.4.4
v4.4.5
v4.4.6
v4.4.7
v4.4.8
v4.4.9
v4.4.10
v4.4.11
v4.4.12
v4.4.13
v4.4.14
v4.4.15
v4.4.16
v4.4.17
v4.4.18
v4.4.19
v4.4.20
v4.4.21
v4.4.22
v4.4.23
v4.4.24
v4.4.25
v4.4.26
v4.4.27
v4.4.28
v4.4.29
v4.4.30
v4.4.31
v4.4.32
v4.4.33
v4.4.34
v4.4.35
v4.4.36
v4.4.37
v4.4.38
v4.4.39
v4.4.40
v4.4.41
v4.4.42
v4.4.43
v4.4.44
v4.4.45
v4.4.46
v4.4.47
v4.4.48
v4.4.49
v4.4.50
v4.4.51
v5.*
v5.0.0-BETA1
v5.0.0-BETA2
v5.0.0-RC1
v5.0.0
v5.0.1
v5.0.2
v5.0.3
v5.0.4
v5.0.5
v5.0.6
v5.0.7
v5.0.8
v5.0.9
v5.0.10
v5.0.11
v5.1.0-BETA1
v5.1.0-RC1
v5.1.0-RC2
v5.1.0
v5.1.1
v5.1.2
v5.1.3
v5.1.4
v5.1.5
v5.1.6
v5.1.7
v5.1.8
v5.1.9
v5.1.10
v5.1.11
v5.2.0-BETA1
v5.2.0-BETA2
v5.2.0-BETA3
v5.2.0-RC1
v5.2.0-RC2
v5.2.0
v5.2.1
v5.2.2
v5.2.3
v5.2.4
v5.2.5
v5.2.6
v5.2.7
v5.2.8
v5.2.9
v5.2.10
v5.2.11
v5.2.12
v5.2.13
v5.2.14
v5.3.0-BETA1
v5.3.0-BETA2
v5.3.0-BETA3
v5.3.0-BETA4
v5.3.0-RC1
v5.3.0
v5.3.1
v5.3.2
v5.3.3
v5.3.4
v5.3.5
v5.3.6
v5.3.7
v5.3.8
v5.3.9
v5.3.10
v5.3.11
v5.3.12
v5.3.13
v5.3.14
v5.3.15
v5.3.16
v5.4.0-BETA1
v5.4.0-BETA2
v5.4.0-BETA3
v5.4.0-RC1
v5.4.0
v5.4.1
v5.4.2
v5.4.3
v5.4.4
v5.4.5
v5.4.6
v5.4.7
v5.4.8
v5.4.9
v5.4.10
v5.4.11
v5.4.12
v5.4.13
v5.4.14
v5.4.15
v5.4.16
v5.4.17
v5.4.18
v5.4.19
v5.4.20
v5.4.21
v5.4.22
v5.4.23
v5.4.24
v5.4.25
v5.4.26
v5.4.27
v5.4.28
v5.4.29
v5.4.30
v5.4.31
v5.4.32
v5.4.33
v5.4.34
v5.4.35
v5.4.36
v5.4.37
v5.4.38
v5.4.39
v5.4.40
v5.4.41
v5.4.42
v5.4.43
v5.4.44
v5.4.45
v5.4.46
v5.4.47
v5.4.48
v5.4.49
v5.4.50
v5.4.51
v5.4.52
v5.4.53

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-r925-mgvr-h9cc/GHSA-r925-mgvr-h9cc.json"