DEBIAN-CVE-2026-7790
Uncontrolled Resource Consumption vulnerability in ninenines cowlib (cow_http_te module) allows Excessive Allocation. The chunked transfer-encoding parser in cow_http_te accepts an unbounded number of hex digits in the chunk-size field. Each digit causes a bignum multiplication (Len * 16 + digit), so parsing N hex digits requires O(N²) CPU work and O(N) memory. Additionally, when input is drip-fed, the parser discards the accumulated length on each partial read and restarts from zero on resumption, raising the cost to O(N³). An unauthenticated remote attacker can exploit this by sending an HTTP/1.1 request with Transfer-Encoding: chunked and a very long chunk-size hex string to cause denial of service through CPU exhaustion and memory amplification. This vulnerability is associated with program file src/cow_http_te.erl and program routines cow_http_te:stream_chunked/2, cow_http_te:chunked_len/4. This issue affects cowlib: from 0.6.0 before 2.16.1.
DEBIAN-CVE-2026-7790
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-2026-7790
erlang-cowlib
Source reference: /affected/0/package/name
- Affected versions
- 1.3.0-3
Source reference:
/affected/0/versions2.17.1-1Source reference:
/affected/0/versions2.17.1-2Source reference:
/affected/0/versions2.18.0-1Source reference:
/affected/0/versions2.19.0-1Source reference:
/affected/0/versions2.20.0-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
erlang-cowlib
Source reference: /affected/1/package/name
- Affected versions
- 1.3.0-3
Source reference:
/affected/1/versions2.17.1-1Source reference:
/affected/1/versions2.17.1-2Source reference:
/affected/1/versions2.18.0-1Source reference:
/affected/1/versions2.19.0-1Source reference:
/affected/1/versions2.20.0-1Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
erlang-cowlib
Source reference: /affected/2/package/name
- Affected versions
- 1.3.0-3
Source reference:
/affected/2/versions - Fixed versions
- 2.17.1-1
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": "erlang-cowlib",
"purl": "pkg:deb/debian/erlang-cowlib?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1.3.0-3",
"2.17.1-1",
"2.17.1-2",
"2.18.0-1",
"2.19.0-1",
"2.20.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-7790.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "erlang-cowlib",
"purl": "pkg:deb/debian/erlang-cowlib?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.3.0-3",
"2.17.1-1",
"2.17.1-2",
"2.18.0-1",
"2.19.0-1",
"2.20.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-7790.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.17.1-1"
}
]
}
],
"package": {
"name": "erlang-cowlib",
"purl": "pkg:deb/debian/erlang-cowlib?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.3.0-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-7790.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #58340 · Revision 1
- Added to Heist Feed
- Publisher date