CVE catalog

CVE-2021-31317

rlottie: CVE-2021-31317

Severity: Medium
Published: May 18, 2021, 8:15:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 1.29% · Oct 25, 2026

Telegram Android <7.1.0 (2090), Telegram iOS <7.1, and Telegram macOS <7.1 are affected by a Type Confusion in the VDasher constructor of their custom fork of the rlottie library. A remote attacker might be able to access Telegram's heap memory out-of-bounds on a victim device via a malicious animated sticker.

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	rlottie	sid	`0.1+dfsg-5`	fixed
Debian	rlottie	forky	`0.1+dfsg-5`	fixed
Debian	rlottie	trixie	`0.1+dfsg-4.2+deb13u2`	fixed
Debian	rlottie	bookworm	`0.1+dfsg-4+deb12u2`	fixed
Ubuntu	rlottie	pro	`0~git20190721.24346d0+dfsg-2`	vulnerable
Ubuntu	rlottie	pro	`0~git20190721.24346d0+dfsg-2build1`	vulnerable
Ubuntu	rlottie	pro	`0~git20200305.a717479+dfsg-1`	vulnerable
Ubuntu	rlottie	pro	`0~git20200305.a717479+dfsg-1ubuntu0.1~esm1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	rlottie	source	sid	`0.1+dfsg-2`	not yet assigned	Not reported	[988885]
Debian	rlottie	source	forky	`0.1+dfsg-2`	not yet assigned	Not reported	[988885]
Debian	rlottie	source	trixie	`0.1+dfsg-2`	not yet assigned	Not reported	[988885]
Debian	rlottie	source	bookworm	`0.1+dfsg-2`	not yet assigned	Not reported	[988885]
Ubuntu	rlottie	deb	pro	`0~git20200305.a717479+dfsg-1ubuntu0.1~esm1`	Not reported	UBUNTU-CVE-2021-31317	Not reported

[Debian bug #988885]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[librlottie0-1]Fixed
Source package: [rlottie]
Details (2)
- 0.1+dfsg-4+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 0.1+dfsg-2
  dsa · rlottie · debian · bookworm; dsa · rlottie · debian · 12
- 0.1+dfsg-4+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 0.1+dfsg-2
  dsa · rlottie · debian · bookworm; dsa · rlottie · debian · 12
[librlottie-dev]Fixed
Source package: [rlottie]
Details (2)
- 0.1+dfsg-4+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 0.1+dfsg-2
  dsa · rlottie · debian · bookworm; dsa · rlottie · debian · 12
- 0.1+dfsg-4+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 0.1+dfsg-2
  dsa · rlottie · debian · bookworm; dsa · rlottie · debian · 12

[Debian 13 (Trixie)]

[librlottie0-1]Fixed
Source package: [rlottie]
Details (2)
- 0.1+dfsg-4.2+deb13u2 · amd64 · trixie
  Fixed · Fixed: 0.1+dfsg-2
  dsa · rlottie · debian · 13
- 0.1+dfsg-4.2+deb13u2 · arm64 · trixie
  Fixed · Fixed: 0.1+dfsg-2
  dsa · rlottie · debian · 13
[librlottie-dev]Fixed
Source package: [rlottie]
Details (2)
- 0.1+dfsg-4.2+deb13u2 · amd64 · trixie
  Fixed · Fixed: 0.1+dfsg-2
  dsa · rlottie · debian · 13
- 0.1+dfsg-4.2+deb13u2 · arm64 · trixie
  Fixed · Fixed: 0.1+dfsg-2
  dsa · rlottie · debian · 13

Observed: Oct 23, 2026, 5:56:52 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database]