CVE catalog

CVE-2020-29573

glibc: CVE-2020-29573

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Sep 22, 2020, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 2.72% · Oct 25, 2026

sysdeps/i386/ldbl2mpn.c in the GNU C Library (aka glibc or libc6) before 2.23 on x86 targets has a stack-based buffer overflow if the input to any of the printf family of functions is an 80-bit long double with a non-canonical bit pattern, as seen when passing a \x00\x04\x00\x00\x00\x00\x00\x00\x00\x04 value to sprintf. NOTE: the issue does not affect glibc by default in 2016 or later (i.e., 2.23 or later) because of commits made in 2015 for inlining of C99 math functions through use of GCC built-ins. In other words, the reference to 2.23 is intentional despite the mention of "Fixed for glibc 2.33" in the 26649 reference.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	glibc	sid	`2.43-7`	fixed
Debian	glibc	forky	`2.43-7`	fixed
Debian	glibc	trixie	`2.41-12+deb13u4`	fixed
Debian	glibc	bookworm	`2.36-9+deb12u14`	fixed
Debian	glibc	bookworm-security	`2.36-9+deb12u7`	fixed
Cpe	glibc	Not reported	`2.23`	fixed
Cpe	enterprise_linux	Not reported	Not reported	unknown
Cpe	cloud_backup	Not reported	Not reported	unknown
Cpe	solidfire_baseboard_management_controller	Not reported	Not reported	unknown
Ubuntu	eglibc	pro	`2.17-93ubuntu4`	vulnerable
Ubuntu	eglibc	pro	`2.18-0ubuntu1`	vulnerable
Ubuntu	eglibc	pro	`2.18-0ubuntu2`	vulnerable
Ubuntu	eglibc	pro	`2.18-0ubuntu4`	vulnerable
Ubuntu	eglibc	pro	`2.18-0ubuntu5`	vulnerable
Ubuntu	eglibc	pro	`2.18-0ubuntu6`	vulnerable
Ubuntu	eglibc	pro	`2.18-0ubuntu7`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu2`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu3`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu4`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu5`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.1`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.3`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.4`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.5`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.6`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.7`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.8`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.9`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.10`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.11`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.13`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.14`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.15`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.15+esm1`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.15+esm2`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.15+esm3`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.15+esm4`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	glibc	source	sid	`2.23-1`	not yet assigned	Not reported	Not reported
Debian	glibc	source	forky	`2.23-1`	not yet assigned	Not reported	Not reported
Debian	glibc	source	trixie	`2.23-1`	not yet assigned	Not reported	Not reported
Debian	glibc	source	bookworm	`2.23-1`	not yet assigned	Not reported	Not reported
Cpe	glibc	cpe	Not reported	`2.23`	Not reported	NVD-CVE-2020-29573	Not reported

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[glibc-doc]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
[glibc-source]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
[libc6]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
[libc6-dbg]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
[libc6-dev]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
[libc6-dev-i386]Unknown
Source package: [glibc]
Details (2)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
[libc6-dev-x32]Unknown
Source package: [glibc]
Details (2)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
[libc6-i386]Unknown
Source package: [glibc]
Details (2)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
[libc6-x32]Unknown
Source package: [glibc]
Details (2)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
[libc-bin]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
[libc-dev-bin]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
[libc-devtools]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
[libc-l10n]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
[locales]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
[locales-all]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
[nscd]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.23-1
  dsa · glibc · debian · bookworm

Observed: Oct 23, 2026, 5:51:25 PM UTC

References

[CERT-Bund public advisories] · [CISA cybersecurity advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]