DEBIAN-CVE-2026-43970
Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in ninenines cowlib allows unauthenticated remote denial of service via memory exhaustion. cow_spdy:inflate/2 in cowlib passes peer-supplied compressed bytes directly to zlib:inflate/2 with no output size bound. The SPDY header compression dictionary (?ZDICT) is public, and zlib compresses long runs of repeated bytes at roughly 1024:1, so a few kilobytes of SPDY frame payload can decompress to gigabytes on the BEAM heap, OOM-killing the node. A single unauthenticated SPDY frame is sufficient to trigger the condition. The parsers for syn_stream, syn_reply, and headers frame types are all affected via cow_spdy:parse_headers/2. This issue affects cowlib from 0.1.0 before 2.16.1.
DEBIAN-CVE-2026-43970
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-2026-43970
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-2026-43970.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-2026-43970.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-2026-43970.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #56540 · Revision 1
- Added to Heist Feed
- Publisher date