PYSEC-2026-1922

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/signxml/PYSEC-2026-1922.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-1922
Aliases
Published
2026-07-07T16:02:53.797116Z
Modified
2026-07-07T17:48:12.603963915Z
Severity
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
SignXML's signature verification with HMAC is vulnerable to a timing attack
Details

When verifying signatures with X509 certificate validation turned off and HMAC shared secret set (signxml.XMLVerifier.verify(require_x509=False, hmac_key=...), prior versions of SignXML are vulnerable to a potential timing attack. The verifier may leak information about the correct HMAC when comparing it with the user supplied hash, allowing users to reconstruct the correct HMAC for any data.

References

Affected packages

PyPI / signxml

Package

Name
signxml
View open source insights on deps.dev
Purl
pkg:pypi/signxml

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.0.4

Affected versions

0.*
0.0.1
0.1.0
0.1.1
0.1.2
0.1.3
0.1.4
0.1.5
0.1.6
0.1.7
0.1.8
0.1.9
0.2.0
0.2.1
0.2.2
0.2.3
0.2.4
0.2.5
0.2.6
0.2.7
0.2.8
0.2.9
0.3.0
0.3.1
0.3.2
0.3.3
0.3.4
0.3.5
0.3.6
0.3.7
0.3.8
0.3.9
0.4.0
0.4.1
0.4.2
0.4.3
0.4.4
0.4.5
0.4.6
0.5.0
0.6.0
1.*
1.0.0
1.0.1
1.0.2
2.*
2.0.0
2.1.4
2.2.0
2.2.1
2.2.2
2.2.3
2.2.4
2.2.6
2.3.0
2.4.0
2.5.2
2.6.0
2.7.0
2.7.1
2.7.2
2.7.3
2.8.0
2.8.1
2.8.2
2.9.0
2.10.0
2.10.1
3.*
3.0.0
3.0.1
3.0.2
3.1.0
3.1.1
3.2.0
3.2.1
3.2.2
4.*
4.0.0
4.0.1
4.0.2
4.0.3

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/signxml/PYSEC-2026-1922.yaml"