DEBIAN-CVE-2026-15747
Mojolicious versions from 4.59 before 9.48 for Perl expose a stable representation of the session CSRF token to a BREACH compression oracle. _csrf_token generates and caches one token per session and returns the same value on every call, and _csrf_field places that value in a hidden `csrf_token` input. When a response carrying the token also echoes attacker-controlled input and is gzip-compressed, the chosen values and the resulting compressed lengths form a BREACH oracle. An attacker able to query it can recover the token and pass csrf_protect validation.
DEBIAN-CVE-2026-15747
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-2026-15747
libmojolicious-perl
Source reference: /affected/0/package/name
- Affected versions
- 9.31+dfsg-1
Source reference:
/affected/0/versions9.33+dfsg-1Source reference:
/affected/0/versions9.34+dfsg-1Source reference:
/affected/0/versions9.35+dfsg-1Source reference:
/affected/0/versions9.36+dfsg-1Source reference:
/affected/0/versions9.36+dfsg-1~bpo12+2Source reference:
/affected/0/versions9.37+dfsg-1Source reference:
/affected/0/versions9.37+dfsg-2Source reference:
/affected/0/versions9.37+dfsg-2~bpo12+1Source reference:
/affected/0/versions9.38+dfsg-1Source reference:
/affected/0/versions9.39+dfsg-1Source reference:
/affected/0/versions9.42+dfsg-1Source reference:
/affected/0/versions9.42+dfsg-1~bpo13+2Source reference:
/affected/0/versions9.45+dfsg-1Source reference:
/affected/0/versions9.45+dfsg-2Source reference:
/affected/0/versions9.46+dfsg-1Source reference:
/affected/0/versions9.47+dfsg-1Source reference:
/affected/0/versions9.48+dfsg-1Source reference:
/affected/0/versions9.49+dfsg-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
libmojolicious-perl
Source reference: /affected/1/package/name
- Affected versions
- 9.39+dfsg-1
Source reference:
/affected/1/versions9.42+dfsg-1Source reference:
/affected/1/versions9.42+dfsg-1~bpo13+2Source reference:
/affected/1/versions9.45+dfsg-1Source reference:
/affected/1/versions9.45+dfsg-2Source reference:
/affected/1/versions9.46+dfsg-1Source reference:
/affected/1/versions9.47+dfsg-1Source reference:
/affected/1/versions9.48+dfsg-1Source reference:
/affected/1/versions9.49+dfsg-1Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
libmojolicious-perl
Source reference: /affected/2/package/name
- Affected versions
- 9.39+dfsg-1
Source reference:
/affected/2/versions9.42+dfsg-1Source reference:
/affected/2/versions9.42+dfsg-1~bpo13+2Source reference:
/affected/2/versions9.45+dfsg-1Source reference:
/affected/2/versions9.45+dfsg-2Source reference:
/affected/2/versions9.46+dfsg-1Source reference:
/affected/2/versions9.47+dfsg-1Source reference:
/affected/2/versions - Fixed versions
- 9.48+dfsg-1
Source reference:
/affected/2/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": "libmojolicious-perl",
"purl": "pkg:deb/debian/libmojolicious-perl?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"9.31+dfsg-1",
"9.33+dfsg-1",
"9.34+dfsg-1",
"9.35+dfsg-1",
"9.36+dfsg-1",
"9.36+dfsg-1~bpo12+2",
"9.37+dfsg-1",
"9.37+dfsg-2",
"9.37+dfsg-2~bpo12+1",
"9.38+dfsg-1",
"9.39+dfsg-1",
"9.42+dfsg-1",
"9.42+dfsg-1~bpo13+2",
"9.45+dfsg-1",
"9.45+dfsg-2",
"9.46+dfsg-1",
"9.47+dfsg-1",
"9.48+dfsg-1",
"9.49+dfsg-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-15747.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libmojolicious-perl",
"purl": "pkg:deb/debian/libmojolicious-perl?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"9.39+dfsg-1",
"9.42+dfsg-1",
"9.42+dfsg-1~bpo13+2",
"9.45+dfsg-1",
"9.45+dfsg-2",
"9.46+dfsg-1",
"9.47+dfsg-1",
"9.48+dfsg-1",
"9.49+dfsg-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-15747.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "9.48+dfsg-1"
}
]
}
],
"package": {
"name": "libmojolicious-perl",
"purl": "pkg:deb/debian/libmojolicious-perl?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"9.39+dfsg-1",
"9.42+dfsg-1",
"9.42+dfsg-1~bpo13+2",
"9.45+dfsg-1",
"9.45+dfsg-2",
"9.46+dfsg-1",
"9.47+dfsg-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-15747.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #55546 · Revision 1
- Added to Heist Feed
- Publisher date