DEBIAN-CVE-2026-62995
joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. in versions 1.7.1 and prior, joserfc accepts JWTs with trailing padding (==) which are not conforming to the JOSE specifications. This leads to malleability of the JWTs when consumed by joserfc. Depending on this application this might or not be an issue. This could lead to bypass of token revocation or anti-replay protection when implemented as a deny list of tokens or a deny list of token hashes. Note that ECDSA JWS are always malleable because of the malleability of ECDSA signatures (first test case in the code bellow). This makes a scheme which assumes that JWTs are not malleable brittle. However for other signatures (or MAC) schemes it might make sense to assume non malleability of the token. This issue has been fixed in version 1.7.2.
DEBIAN-CVE-2026-62995
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-62995
joserfc
Source reference: /affected/0/package/name
- Affected versions
- 1.1.0-1
Source reference:
/affected/0/versions1.2.0-1Source reference:
/affected/0/versions1.2.2-1Source reference:
/affected/0/versions1.3.1-1Source reference:
/affected/0/versions1.3.2-1Source reference:
/affected/0/versions1.3.4-1Source reference:
/affected/0/versions1.4.0-1Source reference:
/affected/0/versions1.4.1-1Source reference:
/affected/0/versions1.4.3-1Source reference:
/affected/0/versions1.5.0-1Source reference:
/affected/0/versions1.6.0-1Source reference:
/affected/0/versions1.6.1-1Source reference:
/affected/0/versions1.6.2-1Source reference:
/affected/0/versions1.6.3-1Source reference:
/affected/0/versions1.6.4-1Source reference:
/affected/0/versions1.6.5-1Source reference:
/affected/0/versions1.6.8-1Source reference:
/affected/0/versions1.7.0-1Source reference:
/affected/0/versions1.7.1-1Source reference:
/affected/0/versions1.7.2-1Source reference:
/affected/0/versions1.7.3-1Source reference:
/affected/0/versions1.7.4-1Source reference:
/affected/0/versions1.7.5-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
joserfc
Source reference: /affected/1/package/name
- Affected versions
- 1.1.0-1
Source reference:
/affected/1/versions1.2.0-1Source reference:
/affected/1/versions1.2.2-1Source reference:
/affected/1/versions1.3.1-1Source reference:
/affected/1/versions1.3.2-1Source reference:
/affected/1/versions1.3.4-1Source reference:
/affected/1/versions1.4.0-1Source reference:
/affected/1/versions1.4.1-1Source reference:
/affected/1/versions1.4.3-1Source reference:
/affected/1/versions1.5.0-1Source reference:
/affected/1/versions1.6.0-1Source reference:
/affected/1/versions1.6.1-1Source reference:
/affected/1/versions1.6.2-1Source reference:
/affected/1/versions1.6.3-1Source reference:
/affected/1/versions1.6.4-1Source reference:
/affected/1/versions1.6.5-1Source reference:
/affected/1/versions1.6.8-1Source reference:
/affected/1/versions1.7.0-1Source reference:
/affected/1/versions1.7.1-1Source reference:
/affected/1/versions - Fixed versions
- 1.7.2-1
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "joserfc",
"purl": "pkg:deb/debian/joserfc?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.1.0-1",
"1.2.0-1",
"1.2.2-1",
"1.3.1-1",
"1.3.2-1",
"1.3.4-1",
"1.4.0-1",
"1.4.1-1",
"1.4.3-1",
"1.5.0-1",
"1.6.0-1",
"1.6.1-1",
"1.6.2-1",
"1.6.3-1",
"1.6.4-1",
"1.6.5-1",
"1.6.8-1",
"1.7.0-1",
"1.7.1-1",
"1.7.2-1",
"1.7.3-1",
"1.7.4-1",
"1.7.5-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-62995.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.7.2-1"
}
]
}
],
"package": {
"name": "joserfc",
"purl": "pkg:deb/debian/joserfc?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.1.0-1",
"1.2.0-1",
"1.2.2-1",
"1.3.1-1",
"1.3.2-1",
"1.3.4-1",
"1.4.0-1",
"1.4.1-1",
"1.4.3-1",
"1.5.0-1",
"1.6.0-1",
"1.6.1-1",
"1.6.2-1",
"1.6.3-1",
"1.6.4-1",
"1.6.5-1",
"1.6.8-1",
"1.7.0-1",
"1.7.1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-62995.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #58094 · Revision 1
- Added to Heist Feed
- Publisher date