CVE catalog
CVE-2026-53501
UBUNTU-
Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, Thumbor’s HMAC validation can be bypassed due to the use of Python’s .replace() when removing the signature from the URL before validation. Since .replace() removes all occurrences of the substring, an attacker can insert the same signature multiple times in the URL and manipulate the final URL used for validation. This allows crafting URLs where the validated string differs from the actual requested resource, enabling loading images from unintended domains or paths. This issue is fixed in 7.8.0.
- Severity
- Unknown
- Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.35% · Oct 27, 2026
Reported versions and fixes
Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.
Version impact has not been established. The original provider fields are retained below.
Provider details and historical evidence
Original provider fields
{
"package_releases": [],
"fixed_versions": [],
"distribution_packages": [
{
"name": "thumbor",
"distro": "debian",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "7.8.0-1"
}
]
}
],
"release": "14",
"versions": [
"6.3.2-3",
"6.3.2-4",
"6.5.1-1",
"6.5.1-2",
"6.5.1-3",
"6.5.1-4",
"6.5.1-5",
"6.5.1-6",
"6.5.1-7",
"6.7.0-1",
"7.7.7-1",
"7.7.7-2",
"7.7.7-3",
"7.7.7-4",
"7.7.7-5",
"7.7.7-6"
],
"ecosystem": "deb",
"fixed_version": "7.8.0-1",
"provider_record_id": "DEBIAN-CVE-2026-53501"
},
{
"name": "thumbor",
"distro": "ubuntu",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"release": "26.04",
"versions": [
"7.7.7-4",
"7.7.7-5"
],
"ecosystem": "deb",
"fixed_version": "",
"provider_record_id": "UBUNTU-CVE-2026-53501"
}
]
}OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
Observed: